sure, you can grow food from such hot air amounts peltiers-backed variants consume more power by itself, added to exhausted and not reliable enough[yet], IMO.actually cheap[and with improved integrity/reliability] phase change systems[yep, like used in you freezer] and liquid metal cooling is more perspective.water is very efficient buy unsuitable for mass-used coolers, coolant, IMO.something biologically/chemically and [dielectric ally]more neutral will fit more. but no [serious]R&D done yet this way.

What exactly are you trying to do? Anyone that has the capabilities of making a water block probably won't be giving it away cheap. And I think you'll find that most people who water cool won't dare try some half ass piece of jury rigged hardware.

I've seen people heat their bathroom floors with piping from their water cooling PCs but a pool would probably be impossible.

If you want to heat anything other than demineralized water + additives against algae etc. I would highly recommend using a heat exchanger and heat your pool/floor/house/waterbed with this.

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MCW-60-80-82's are all thats needed for any ATI 4series and up regardless of reference or after market pcb's.

You'll be running 24/7 with nearly 100% load... this might fry your mosfets easily if you don't cool them properly. This creates noise + hot air again though.

My calculations for water cooling were ~100€ per GPU for the cooling blocks and ~300€-350€ for the radiator, pump, fans and other stuff. Since right now difficulty is shooting up that far, it doesn't really pay off anymore though.

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MCW-60-80-82's are all thats needed for any ATI 4series and up regardless of reference or after market pcb's.

You'll be running 24/7 with nearly 100% load... this might fry your mosfets easily if you don't cool them properly. This creates noise + hot air again though.

Your right but I would assume people would have enough sense to reuse stock back plates and or heatsinks along with some air flow over the cards.

The cost you suggest dont make it worth while to my budget, however ~$35 a piece for MCW-82's does. Say you have 8 gpu's to cool one could manage a car radiator, several pumps or one large one, and hose etc for ~$350 for the whole setup. That could be worth while though I think most would opt to stay on air and buy another gpu or two.

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BTC mining commercial efficiency will drop, even if BTC price will rise[and its probably get at least one more digit], but if GPU horsepower stay demanded outside BTC mining, you can invest in watercooling then.

As for algae, I would think the pool water is already chlorinated for this reason.

And urinated too!

You just don't want to have pool water in your computer, heat exchangers are no rocket science!

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some guys experimenting with such kind of cooling, but they use organic oil for cooling, with [almost]full PC submerge in it.actually there is nothing suitable in automotive/home chemistry shop for sale, while scientist got pretty interesting liquids,s sometimes[4 such purpose]